You can go on a looting spree. *SPOILER*
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Just go to Guiveran then travel north, to efore you fought that big plant boss. Kill the owl looking monster (Moon something) and get high chainlevels. After about 20 mins of only killing them, go back to the warpstone, and travel to some town and sell off your loot. You'll get roughly 200k in 20 mins of killing.
If you're still early in the game, just kill monsters and sell their loot. And go on Mark hunts, that should increase your gold too